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net: never probe IPv4 map support on DragonFly BSD, OpenBSD #45243

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net: never probe IPv4 map support on DragonFly BSD, OpenBSD #45243

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8 changes: 8 additions & 0 deletions src/net/ipsock.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ package net
import (
"context"
"internal/bytealg"
"runtime"
"sync"
)

Expand Down Expand Up @@ -44,6 +45,13 @@ func supportsIPv6() bool {
// IPv4 address inside an IPv6 address at transport layer
// protocols. See RFC 4291, RFC 4038 and RFC 3493.
func supportsIPv4map() bool {
// Some operating systems provide no support for mapping IPv4
// addresses to IPv6, and a runtime check is unnecessary.
switch runtime.GOOS {
case "dragonfly", "openbsd":
return false
}

ipStackCaps.Once.Do(ipStackCaps.probe)
return ipStackCaps.ipv4MappedIPv6Enabled
}
Expand Down